Dark Side of the River by B.J. Daniels is a gripping blend of suspense, mystery, and romance that keeps the reader ensconced in its dark and swirling narrative. Set against the rugged backdrop of Montana's dramatic landscapes, Daniels weaves an intricate tale that takes the reader on an unforgettable journey into the depths of human nature.

The story kicks off with a stark introduction to Grace Patterson, who returns to her hometown of Beartooth, Montana after ten years. The sudden disappearance of her brother, Jamie, during her youth was a mystery that led to her self-imposed exile. Now, with her personal life at a crossroads, Grace comes back to confront her past and the dark secrets that her small town harbors, not realizing that the return would stir more than just old memories.

As Grace delves deeper into the mystery of her brother’s disappearance, she uncovers a web of lies and deceit that runs deep in the community. Daniels does an excellent job in portraying the suffocating, sometimes claustrophobic, nature of small-town gossip and the darkness that it can veil. The narrative expertly intertwines past transgressions with current suspicions, creating an atmosphere thick with tension and suspense.

The pace of the novel is one of its standout features. Daniels manages to maintain a rigorous tempo, with twists and turns that are as unpredictable as the river that flows by the town. Each revelation is meticulously timed to heighten the reader's anticipation, making it nearly impossible to put the book down. The prose is clean and sharp, cutting to the heart of the matter without unnecessary embellishment, which serves the genre and the mood of the book well.

The development of the characters in Dark Side of the River is another area where Daniels excels. Grace, as the protagonist, is a compelling figure—strong, determined, but unmistakably human in her vulnerabilities. Her interactions with the other characters, ranging from old flames to potential foes, are crafted with a realism that adds immense depth to the narrative. The chemistry between Grace and her love interest, a former friend who now works in law enforcement, provides a tender respite from the swirling chaos of the investigation.

Supporting characters, like the gruff but endearing Sheriff Barnett and Grace's estranged father, are portrayed with equal care, each adding layers to the story. Their relationships and relevance to the central mystery are slowly unpeeled, revealing motives and emotions that are realistically conflicted and often heartbreakingly poignant.

Daniels also skillfully employs the setting of Beartooth, Montana as almost another character in the narrative. The stark, often brutal beauty of the landscape mirrors the brutal twists of the plot, and Daniels’ descriptions of the imposing mountains and the relentless river are both eloquent and evocative. This sense of place not only enhances the atmosphere but also heightens the isolation and trepidation that permeate the story.

While the romantic subplot adds a layer of warmth to the tale, Daniels ensures that it never overshadows the main storyline. The balance between the suspenseful journey to uncover the truth and the budding romance is maintained with a deft hand, allowing the story to appeal to fans of both genres without compromising on the integrity of either.

However, where the book slightly falters is in its final chapters. The climax, although intense and well-executed, ties up the ends a bit too neatly. Some readers might find the resolution of the complex webs a bit rushed, though this does little to diminish the overall enjoyment of the book. Furthermore, discussions on complex themes like grief, justice, and redemption are somewhat eclipsed in the rush towards resolution.

In conclusion, Dark Side of the River by B.J. Daniels is a powerful narrative that offers more than just thrills. It is a deeply engaging book that probes the nature of family bonds, the scars left by loss, and the capacity for redemption. Daniels has crafted a small-town mystery with emotional depth and relentless suspense that is sure to resonate with readers looking for a story that both challenges and entertains.